fix: Allow variadic syntax in PHPDoc parameter annotation in gen_stub.php

Closes #20277

Author: mitelg

build/gen_stub.php

@@ -3323,12 +3323,12 @@ public function getType(): string {
         $matches = [];
 
         if ($this->name === "param") {
-            preg_match('/^\s*([\w\|\\\\\[\]<>, ]+)\s*(?:[{(]|\$\w+).*$/', $value, $matches);
+            preg_match('/^\s*([\w\|\\\\\[\]<>, ]+)\s*(?<type>[{(]|(\.\.\.)?\$\w+).*$/', $value, $matches);
         } elseif ($this->name === "return" || $this->name === "var") {
-            preg_match('/^\s*([\w\|\\\\\[\]<>, ]+)/', $value, $matches);
+            preg_match('/^\s*(?<type>[\w\|\\\\\[\]<>, ]+)/', $value, $matches);
         }
 
-        if (!isset($matches[1])) {
+        if (!isset($matches["type"])) {
             throw new Exception("@$this->name doesn't contain a type or has an invalid format \"$value\"");
         }
 
@@ -3345,7 +3345,7 @@ public function getVariableName(): string {
 
         if ($this->name === "param") {
             // Allow for parsing extended types like callable(string):mixed in docblocks
-            preg_match('/^\s*(?<type>[\w\|\\\\]+(?<parens>\((?<inparens>(?:(?&parens)|[^(){}[\]]*+))++\)|\{(?&inparens)\}|\[(?&inparens)\])*+(?::(?&type))?)\s*\$(?<name>\w+).*$/', $value, $matches);
+            preg_match('/^\s*(?<type>[\w\|\\\\]+(?<parens>\((?<inparens>(?:(?&parens)|[^(){}[\]]*+))++\)|\{(?&inparens)\}|\[(?&inparens)\])*+(?::(?&type))?)\s*(\.\.\.)?\$(?<name>\w+).*$/', $value, $matches);
         } elseif ($this->name === "prefer-ref") {
             preg_match('/^\s*\$(?<name>\w+).*$/', $value, $matches);
         }